Hillary Clinton’s lead in the Democratic presidential primary race has grown — and if Vice President Joe Biden decides to stay out of the race, her numbers would rise even higher, a new CNN/ORC poll shows.

Clinton is backed by 42% of Democratic primary voters nationally, compared to 24% for Vermont Sen. Bernie Sanders, 22% for Biden and 1% for former Maryland Gov. Martin O’Malley. That’s a marked improvement over an early September CNN/ORC poll that found Clinton leading Sanders, 37% to 27%, with Biden at 20%.